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Gilbreath transform of the sequence of Sophie Germain primes (A005384), i.e. the diagonal of leading successive absolute differences of A005384.

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2, 1, 1, 3, 1, 1, 1, 3, 1, 1, 1, 1, 3, 1, 1, 3, 1, 3, 1, 1, 1, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 1, 1, 3, 1, 3, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 3, 1, 3, 1, 1, 3, 1, 3, 1, 3, 1, 3, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 1, 3, 1, 1, 3 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Conjecture: The diagonal of leading successive absolute differences of the Sophie Germain primes consists, except for the initial 2, only of 1's and 3s.`
	LINKS	`Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.` `Eric Weisstein's World of Mathematics, Gilbreath's Conjecture`
	EXAMPLE	`The difference table begins:` `2` `3 1` `5 2 1` `11 6 4 3` `23 12 6 2 1` `29 6 6 0 2 1`
	CROSSREFS	`Cf. A005384, A054977, A036262.` `Sequence in context: A106177 A135010 A138138 this_sequence A127949 A167407 A051340` `Adjacent sequences: A080206 A080207 A080208 this_sequence A080210 A080211 A080212`
	KEYWORD	`nonn`
	AUTHOR	`John W. Layman (layman(AT)math.vt.edu), Mar 20 2003`

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.

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